Magnetic and Superconducting Properties of the Heterogeneous Layered Structures V/Fe 0.7 V 0.3 /V/Fe 0.7 V 0.3 /Nb and Nb/Ni 0.65(0.81) Cu 0.35(0.19)

The heterogeneous ferromagnetic–superconducting layered heterostructures V/Fe 0.7 V 0.3 /V/Fe 0.7 V 0.3 /Nb and Nb/Ni 0.65(0.81) Cu 0.35(0.19) , which contain magnetic clusters and ferromagnetic domains, are studied. The magnetic and superconducting properties of the structures depend on the magnetic-layer thickness, the magnetic field, and the time elapsed from structure preparation. We detected the interaction of clusters with a domain structure, diamagnetism and magnetization reversal of the magnetic layer during the superconducting transition in a ferromagnetic–superconducting heterostructure, and a superconducting transition in the magnetic layer. The magnetic and resistive properties of the heterostructures changed in several weeks and months.